Alert archive / Wyoming / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 14, NWS Riverton, WY

May 29, 2014Natrona County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at May 29, 2014, 4:57 PM MDT for Natrona County, Wyoming. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 29, 2014, 4:57 PM MDT (22:57 UTC)
Expired: May 29, 2014, 5:45 PM MDT
In force: 48 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 137 km from the middle of the area, began a volume at 23:00 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 11.0 hours before the alert went out and 339 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 18 J/kg
Mixed-layer CIN: -491 J/kg
Mixed-layer LCL: 2577 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: -43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at May 29, 4:14 PM MDT, 43 minutes earlier.

Area forecast discussion, May 29, 4:14 PM MDT, 43 minutes before

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Hazardous weather outlook, May 29, 1:30 PM MDT, 3 hours 27 minutes before

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In the hours before

Special weather statement, May 29, 12:56 PM MDT, 4 hours 1 minute before

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Special weather statement, May 29, 1:41 PM MDT, 3 hours 16 minutes before

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Special weather statement, May 29, 2:45 PM MDT, 2 hours 12 minutes before

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Special weather statement, May 29, 3:46 PM MDT, 1 hour 11 minutes before

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Special weather statement, May 29, 4:33 PM MDT, 24 minutes before

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Special weather statement, May 29, 4:55 PM MDT, 2 minutes before

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The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 28, 6:37 PM MDT	Special Weather Statement	RIW	Natrona	38 min
May 28, 7:02 PM MDT	Special Weather Statement	RIW	Hot Springs	43 min
May 28, 7:46 PM MDT	Special Weather Statement	RIW	Fremont	44 min
May 29, 1:29 PM MDT	Areal Flood Advisory	RIW	Teton	30 hr
May 29, 4:33 PM MDT	Special Weather Statement	RIW	Natrona	42 min
May 29, 4:55 PM MDT	Special Weather Statement	RIW	Sweetwater	50 min
May 29, 5:24 PM MDT	Special Weather Statement	RIW	Sweetwater	51 min
May 29, 5:34 PM MDT	Special Weather Statement	RIW	Washakie	41 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2014 Every severe thunderstorm warning in 2014

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.